def test_abcd_e(self): self.assertEqual(count_letters('abcd', 'e'), 0)
def test_peanut_t(self): self.assertEqual(count_letters('peanut', 't'), 1)
def test_happy_p(self): self.assertEqual(count_letters('happy', 'p'), 2)
def test_fuzzy(): assert_equal(count_letters('fuzzy','z'), 2)
def test_blank(): assert_equal(count_letters('','a'), 0)
def test_none(): assert_equal(count_letters('none','a'), 0)
def test_potato(): assert_equal(count_letters('potato','p'), 1)
def test_peanut_t(self): self.assertEqual(count_letters('peanut','t'),1)
def test_happy_p(self): self.assertEqual(count_letters('happy','p'),2)
def test_abcd_e(self): self.assertEqual(count_letters('abcd','e'),0)
def test_blank(): assert_equal(count_letters('', 'a'), 0)
def test_fuzzy(): assert_equal(count_letters('fuzzy', 'z'), 2)
def test_potato(): assert_equal(count_letters('potato', 'p'), 1)
def test_none(): assert_equal(count_letters('none', 'a'), 0)